// Purpose: interface of wxImageHandler and wxImage
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
+/**
+ Possible values for the image resolution option.
+
+ @see wxImage::GetOptionInt().
+ */
+enum wxImageResolution
+{
+ /// Resolution not specified.
+ wxIMAGE_RESOLUTION_NONE = 0,
+
+ /// Resolution specified in inches.
+ wxIMAGE_RESOLUTION_INCHES = 1,
+
+ /// Resolution specified in centimetres.
+ wxIMAGE_RESOLUTION_CM = 2
+};
+
+/**
+ Image resize algorithm.
+
+ This is used with wxImage::Scale() and wxImage::Rescale().
+ */
+enum wxImageResizeQuality
+{
+ /// Simplest and fastest algorithm.
+ wxIMAGE_QUALITY_NEAREST,
+
+ /// Compromise between wxIMAGE_QUALITY_NEAREST and wxIMAGE_QUALITY_BICUBIC.
+ wxIMAGE_QUALITY_BILINEAR,
+
+ /// Highest quality but slowest execution time.
+ wxIMAGE_QUALITY_BICUBIC,
+
+ /**
+ Use surrounding pixels to calculate an average that will be used for
+ new pixels. This method is typically used when reducing the size of
+ an image.
+ */
+ wxIMAGE_QUALITY_BOX_AVERAGE,
+
+ /**
+ Default image resizing algorithm used by wxImage::Scale(). Currently
+ the same as wxIMAGE_QUALITY_NEAREST.
+ */
+ wxIMAGE_QUALITY_NORMAL,
+
+ /**
+ Best image resizing algorithm. Since version 2.9.2 this results in
+ wxIMAGE_QUALITY_BOX_AVERAGE being used when reducing the size of the
+ image (meaning that both the new width and height will be smaller than
+ the original size). Otherwise wxIMAGE_QUALITY_BICUBIC is used.
+ */
+ wxIMAGE_QUALITY_HIGH
+};
+
+/**
+ Possible values for PNG image type option.
+
+ @see wxImage::GetOptionInt().
+ */
+enum wxImagePNGType
+{
+ wxPNG_TYPE_COLOUR = 0, ///< Colour PNG image.
+ wxPNG_TYPE_GREY = 2, ///< Greyscale PNG image converted from RGB.
+ wxPNG_TYPE_GREY_RED = 3, ///< Greyscale PNG image using red as grey.
+ wxPNG_TYPE_PALETTE = 4 ///< Palette encoding.
+};
+
+
+/**
+ Image option names.
+*/
+#define wxIMAGE_OPTION_QUALITY wxString("quality")
+#define wxIMAGE_OPTION_FILENAME wxString("FileName")
+#define wxIMAGE_OPTION_RESOLUTION wxString("Resolution")
+#define wxIMAGE_OPTION_RESOLUTIONX wxString("ResolutionX")
+#define wxIMAGE_OPTION_RESOLUTIONY wxString("ResolutionY")
+#define wxIMAGE_OPTION_RESOLUTIONUNIT wxString("ResolutionUnit")
+#define wxIMAGE_OPTION_MAX_WIDTH wxString("MaxWidth")
+#define wxIMAGE_OPTION_MAX_HEIGHT wxString("MaxHeight")
+#define wxIMAGE_OPTION_ORIGINAL_WIDTH wxString("OriginalWidth")
+#define wxIMAGE_OPTION_ORIGINAL_HEIGHT wxString("OriginalHeight")
+
+#define wxIMAGE_OPTION_BMP_FORMAT wxString("wxBMP_FORMAT")
+#define wxIMAGE_OPTION_CUR_HOTSPOT_X wxString("HotSpotX")
+#define wxIMAGE_OPTION_CUR_HOTSPOT_Y wxString("HotSpotY")
+
+#define wxIMAGE_OPTION_GIF_COMMENT wxString("GifComment")
+
+#define wxIMAGE_OPTION_PNG_FORMAT wxString("PngFormat")
+#define wxIMAGE_OPTION_PNG_BITDEPTH wxString("PngBitDepth")
+#define wxIMAGE_OPTION_PNG_FILTER wxString("PngF")
+#define wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL wxString("PngZL")
+#define wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL wxString("PngZM")
+#define wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY wxString("PngZS")
+#define wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE wxString("PngZB")
+
+#define wxIMAGE_OPTION_TIFF_BITSPERSAMPLE wxString("BitsPerSample")
+#define wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL wxString("SamplesPerPixel")
+#define wxIMAGE_OPTION_TIFF_COMPRESSION wxString("Compression")
+#define wxIMAGE_OPTION_TIFF_PHOTOMETRIC wxString("Photometric")
+#define wxIMAGE_OPTION_TIFF_IMAGEDESCRIPTOR wxString("ImageDescriptor")
+
+
+enum
+{
+ wxBMP_24BPP = 24, // default, do not need to set
+ //wxBMP_16BPP = 16, // wxQuantize can only do 236 colors?
+ wxBMP_8BPP = 8, // 8bpp, quantized colors
+ wxBMP_8BPP_GREY = 9, // 8bpp, rgb averaged to greys
+ wxBMP_8BPP_GRAY = wxBMP_8BPP_GREY,
+ wxBMP_8BPP_RED = 10, // 8bpp, red used as greyscale
+ wxBMP_8BPP_PALETTE = 11, // 8bpp, use the wxImage's palette
+ wxBMP_4BPP = 4, // 4bpp, quantized colors
+ wxBMP_1BPP = 1, // 1bpp, quantized "colors"
+ wxBMP_1BPP_BW = 2 // 1bpp, black & white from red
+};
+
+
/**
@class wxImageHandler
If you wish to extend the capabilities of wxImage, derive a class from
wxImageHandler and add the handler using wxImage::AddHandler in your
- application initialisation.
+ application initialization.
Note that all wxImageHandlers provided by wxWidgets are part of
the @ref page_libs_wxcore library.
::wxNullImage
@library{wxcore}
- @category{misc}
+ @category{gdi}
@see wxImage, wxInitAllImageHandlers()
*/
virtual ~wxImageHandler();
/**
- Gets the file extension associated with this handler.
+ Returns @true if this handler supports the image format contained in the
+ given stream.
+
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
+ */
+ bool CanRead( wxInputStream& stream );
+
+ /**
+ Returns @true if this handler supports the image format contained in the
+ file with the given name.
+
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
+ */
+ bool CanRead( const wxString& filename );
+
+ /**
+ Gets the preferred file extension associated with this handler.
+
+ @see GetAltExtensions()
*/
const wxString& GetExtension() const;
+ /**
+ Returns the other file extensions associated with this handler.
+
+ The preferred extension for this handler is returned by GetExtension().
+
+ @since 2.9.0
+ */
+ const wxArrayString& GetAltExtensions() const;
+
/**
If the image file contains more than one image and the image handler is capable
of retrieving these individually, this function will return the number of
@param stream
Opened input stream for reading image data.
- Currently, the stream must support seeking.
+ This function doesn't modify the current stream position (because it
+ restores the original position before returning; this however requires the
+ stream to be seekable; see wxStreamBase::IsSeekable).
@return Number of available images. For most image handlers, this is 1
- (exceptions are TIFF and ICO formats).
+ (exceptions are TIFF and ICO formats as well as animated GIFs
+ for which this function returns the number of frames in the
+ animation).
*/
virtual int GetImageCount(wxInputStream& stream);
The image object which is to be affected by this operation.
@param stream
Opened output stream for writing the data.
+ @param verbose
+ If set to @true, errors reported by the image handler will produce
+ wxLogMessages.
@return @true if the operation succeeded, @false otherwise.
bool verbose = true);
/**
- Sets the handler extension.
+ Sets the preferred file extension associated with this handler.
@param extension
- Handler extension.
+ File extension without leading dot.
+
+ @see SetAltExtensions()
*/
void SetExtension(const wxString& extension);
+ /**
+ Sets the alternative file extensions associated with this handler.
+
+ @param extensions
+ Array of file extensions.
+
+ @see SetExtension()
+
+ @since 2.9.0
+ */
+ void SetAltExtensions(const wxArrayString& extensions);
+
/**
Sets the handler MIME type.
Handler name.
*/
void SetName(const wxString& name);
+
+ /**
+ Retrieve the version information about the image library used by this
+ handler.
+
+ This method is not present in wxImageHandler class itself but is
+ present in a few of the classes deriving from it, currently
+ wxJPEGHandler, wxPNGHandler and wxTIFFHandler. It returns the
+ information about the version of the image library being used for the
+ corresponding handler implementation.
+
+ @since 2.9.2
+ */
+ static wxVersionInfo GetLibraryVersionInfo();
+
+protected:
+ /**
+ Called to get the number of images available in a multi-image file
+ type, if supported.
+
+ NOTE: this function is allowed to change the current stream position
+ since GetImageCount() will take care of restoring it later
+ */
+ virtual int DoGetImageCount( wxInputStream& stream );
+
+ /**
+ Called to test if this handler can read an image from the given stream.
+
+ NOTE: this function is allowed to change the current stream position
+ since CallDoCanRead() will take care of restoring it later
+ */
+ virtual bool DoCanRead( wxInputStream& stream ) = 0;
};
*/
const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;
+const unsigned char wxIMAGE_ALPHA_THRESHOLD = 0x80;
+
+
/**
@class wxImage
the wxBitmap::wxBitmap(wxImage,int depth) constructor.
This bitmap can then be drawn in a device context, using wxDC::DrawBitmap.
+ More on the difference between wxImage and wxBitmap: wxImage is just a
+ buffer of RGB bytes with an optional buffer for the alpha bytes. It is all
+ generic, platform independent and image file format independent code. It
+ includes generic code for scaling, resizing, clipping, and other manipulations
+ of the image data. OTOH, wxBitmap is intended to be a wrapper of whatever is
+ the native image format that is quickest/easiest to draw to a DC or to be the
+ target of the drawing operations performed on a wxMemoryDC. By splitting the
+ responsibilities between wxImage/wxBitmap like this then it's easier to use
+ generic code shared by all platforms and image types for generic operations and
+ platform specific code where performance or compatibility is needed.
+
One colour value of the image may be used as a mask colour which will lead to
the automatic creation of a wxMask object associated to the bitmap object.
The constants ::wxIMAGE_ALPHA_TRANSPARENT and ::wxIMAGE_ALPHA_OPAQUE can be
used to indicate those values in a more readable form.
- Unlike RGB data, not all images have an alpha channel and before using
- wxImage::GetAlpha you should check if this image contains an alpha channel
- with wxImage::HasAlpha. Note that currently only the PNG format has full
- alpha channel support so only the images loaded from PNG files can have
- alpha and, if you initialize the image alpha channel yourself using
- wxImage::SetAlpha, you should save it in PNG format to avoid losing it.
+ While all images have RGB data, not all images have an alpha channel. Before
+ using wxImage::GetAlpha you should check if this image contains an alpha
+ channel with wxImage::HasAlpha. Currently the BMP, PNG, TGA, and TIFF format
+ handlers have full alpha channel support for loading so if you want to use
+ alpha you have to use one of these formats. If you initialize the image
+ alpha channel yourself using wxImage::SetAlpha, you should save it in
+ either PNG, TGA, or TIFF format to avoid losing it as these are the only
+ handlers that currently support saving with alpha.
@section image_handlers Available image handlers
To use other image formats, install the appropriate handler with
wxImage::AddHandler or call ::wxInitAllImageHandlers().
- - wxBMPHandler: For loading and saving, always installed.
- - wxPNGHandler: For loading (including alpha support) and saving.
+ - wxBMPHandler: For loading (including alpha support) and saving, always installed.
+ - wxPNGHandler: For loading and saving. Includes alpha support.
- wxJPEGHandler: For loading and saving.
- - wxGIFHandler: Only for loading, due to legal issues.
+ - wxGIFHandler: For loading and saving (see below).
- wxPCXHandler: For loading and saving (see below).
- wxPNMHandler: For loading and saving (see below).
- - wxTIFFHandler: For loading and saving.
- - wxTGAHandler: For loading only.
+ - wxTIFFHandler: For loading and saving. Includes alpha support.
+ - wxTGAHandler: For loading and saving. Includes alpha support.
- wxIFFHandler: For loading only.
- wxXPMHandler: For loading and saving.
- wxICOHandler: For loading and saving.
Loading PNMs only works for ASCII or raw RGB images.
When saving in PNM format, wxPNMHandler will always save as raw RGB.
+ Saving GIFs requires images of maximum 8 bpp (see wxQuantize), and the alpha channel converted to a mask (see wxImage::ConvertAlphaToMask).
+ Saving an animated GIF requires images of the same size (see wxGIFHandler::SaveAnimation)
@library{wxcore}
@category{gdi}
class wxImage : public wxObject
{
public:
+ /**
+ A simple class which stores red, green and blue values as 8 bit unsigned integers
+ in the range of 0-255.
+ */
class RGBValue
{
public:
Constructor for RGBValue, an object that contains values for red, green
and blue which represent the value of a color.
- It is used by wxImage::HSVtoRGB and wxImage::RGBtoHSV, which converts
+ It is used by wxImage::HSVtoRGB and wxImage::RGBtoHSV, which convert
between HSV color space and RGB color space.
*/
RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0);
+
+ unsigned char red;
+ unsigned char green;
+ unsigned char blue;
};
+ /**
+ A simple class which stores hue, saturation and value as doubles in the range 0.0-1.0.
+ */
class HSVValue
{
public:
Constructor for HSVValue, an object that contains values for hue, saturation
and value which represent the value of a color.
- It is used by wxImage::HSVtoRGB() and wxImage::RGBtoHSV(), which converts
+ It is used by wxImage::HSVtoRGB() and wxImage::RGBtoHSV(), which convert
between HSV color space and RGB color space.
*/
HSVValue(double h=0.0, double s=0.0, double v=0.0);
+
+ double hue;
+ double saturation;
+ double value;
};
/**
*/
wxImage(int width, int height, bool clear = true);
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, bool clear = true);
+
/**
Creates an image from data in memory. If @a static_data is @false
then the wxImage will take ownership of the data and free it
Indicates if the data should be free'd after use
*/
- wxImage(int width, int height, unsigned char* data, bool static_data = false);
+ wxImage(int width, int height, unsigned char* data, bool static_data = false);
+
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, unsigned char* data, bool static_data = false);
/**
Creates an image from data in memory. If @a static_data is @false
wxImage(int width, int height, unsigned char* data, unsigned char* alpha,
bool static_data = false );
+ /**
+ @overload
+ */
+ wxImage(const wxSize& sz, unsigned char* data, unsigned char* alpha,
+ bool static_data = false);
+
/**
Creates an image from XPM data.
@param xpmData
A pointer to XPM image data.
+
+ @beginWxPerlOnly
+ Not supported by wxPerl.
+ @endWxPerlOnly
*/
wxImage(const char* const* xpmData);
@li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
@li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
@li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
- @li wxBITMAP_TYPE_TIF: Load a TIFF bitmap file.
+ @li wxBITMAP_TYPE_TIFF: Load a TIFF bitmap file.
@li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
@li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
@li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
*/
wxImage(wxInputStream& stream, const wxString& mimetype, int index = -1);
-
/**
Destructor.
*/
virtual ~wxImage();
+
+
/**
- Register an image handler.
+ @name Image creation, initialization and deletion functions
*/
- static void AddHandler(wxImageHandler* handler);
+ //@{
+
+ /**
+ Returns an identical copy of this image.
+ */
+ wxImage Copy() const;
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create(int width, int height, bool clear = true);
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, bool clear = true );
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,unsigned char*,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create( int width, int height, unsigned char* data, bool static_data = false );
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, unsigned char* data, bool static_data = false );
+
+ /**
+ Creates a fresh image.
+ See wxImage::wxImage(int,int,unsigned char*,unsigned char*,bool) for more info.
+
+ @return @true if the call succeeded, @false otherwise.
+ */
+ bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
+
+ /**
+ @overload
+ */
+ bool Create( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false );
+
+ /**
+ Initialize the image data with zeroes (the default) or with the
+ byte value given as @a value.
+
+ @since 2.9.0
+ */
+ void Clear(unsigned char value = 0);
+
+ /**
+ Destroys the image data.
+ */
+ void Destroy();
+
+ /**
+ Initializes the image alpha channel data.
+
+ It is an error to call it if the image already has alpha data.
+ If it doesn't, alpha data will be by default initialized to all pixels
+ being fully opaque. But if the image has a mask colour, all mask pixels
+ will be completely transparent.
+ */
+ void InitAlpha();
+
+ //@}
+
+
+ /**
+ @name Image manipulation functions
+ */
+ //@{
/**
Blurs the image in both horizontal and vertical directions by the
wxImage BlurVertical(int blurRadius) const;
/**
- Returns @true if the current image handlers can read this file
+ Returns a mirrored copy of the image.
+ The parameter @a horizontally indicates the orientation.
*/
- static bool CanRead(const wxString& filename);
+ wxImage Mirror(bool horizontally = true) const;
/**
- Deletes all image handlers.
- This function is called by wxWidgets on exit.
+ Copy the data of the given @a image to the specified position in this image.
*/
- static void CleanUpHandlers();
+ void Paste(const wxImage& image, int x, int y);
/**
- Computes the histogram of the image. @a histogram is a reference to
- wxImageHistogram object. wxImageHistogram is a specialization of
- wxHashMap "template" and is defined as follows:
+ Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
+ */
+ void Replace(unsigned char r1, unsigned char g1,
+ unsigned char b1, unsigned char r2,
+ unsigned char g2, unsigned char b2);
- @code
- class WXDLLEXPORT wxImageHistogramEntry
- {
- public:
- wxImageHistogramEntry() : index(0), value(0) {}
- unsigned long index;
- unsigned long value;
- };
+ /**
+ Changes the size of the image in-place by scaling it: after a call to this
+ function,the image will have the given width and height.
- WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
- wxIntegerHash, wxIntegerEqual,
- wxImageHistogram);
- @endcode
+ For a description of the @a quality parameter, see the Scale() function.
+ Returns the (modified) image itself.
- @return Returns number of colours in the histogram.
+ @see Scale()
*/
- unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
+ wxImage& Rescale(int width, int height,
+ wxImageResizeQuality quality = wxIMAGE_QUALITY_NORMAL);
/**
- If the image has alpha channel, this method converts it to mask.
+ Changes the size of the image in-place without scaling it by adding either a
+ border with the given colour or cropping as necessary.
- All pixels with alpha value less than @a threshold are replaced with mask
- colour and the alpha channel is removed. Mask colour is chosen automatically
- using FindFirstUnusedColour().
+ The image is pasted into a new image with the given @a size and background
+ colour at the position @a pos relative to the upper left of the new image.
- If the image image doesn't have alpha channel, ConvertAlphaToMask() does nothing.
+ If @a red = green = blue = -1 then use either the current mask colour
+ if set or find, use, and set a suitable mask colour for any newly exposed
+ areas.
- @return @false if FindFirstUnusedColour returns @false, @true otherwise.
- */
- bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
+ @return The (modified) image itself.
- /**
- @deprecated
- Use the equivalent @ref wxBitmap::wxBitmap "wxBitmap constructor"
- (which takes wxImage and depth as its arguments) instead.
+ @see Size()
*/
- wxBitmap ConvertToBitmap() const;
+ wxImage& Resize(const wxSize& size, const wxPoint& pos, int red = -1,
+ int green = -1, int blue = -1);
/**
- Returns a greyscale version of the image.
+ Rotates the image about the given point, by @a angle radians.
- The returned image uses the luminance component of the original to
- calculate the greyscale. Defaults to using the standard ITU-T BT.601
- when converting to YUV, where every pixel equals
- (R * @a lr) + (G * @a lg) + (B * @a lb).
- */
- wxImage ConvertToGreyscale(double lr = 0.299, double lg = 0.587, double lb = 1.114) const;
+ Passing @true to @a interpolating results in better image quality, but is slower.
- /**
- Returns monochromatic version of the image.
+ If the image has a mask, then the mask colour is used for the uncovered
+ pixels in the rotated image background. Else, black (rgb 0, 0, 0) will be used.
- The returned image has white colour where the original has @e (r,g,b)
- colour and black colour everywhere else.
+ Returns the rotated image, leaving this image intact.
*/
- wxImage ConvertToMono(unsigned char r, unsigned char g, unsigned char b) const;
+ wxImage Rotate(double angle, const wxPoint& rotationCentre,
+ bool interpolating = true,
+ wxPoint* offsetAfterRotation = NULL) const;
/**
- Returns an identical copy of the image.
+ Returns a copy of the image rotated 90 degrees in the direction
+ indicated by @a clockwise.
*/
- wxImage Copy() const;
+ wxImage Rotate90(bool clockwise = true) const;
/**
- Creates a fresh image.
-
- If @a clear is @true, the new image will be initialized to black.
- Otherwise, the image data will be uninitialized.
-
- @param width
- The width of the image in pixels.
- @param height
- The height of the image in pixels.
- @param clear
- If @true, initialize the image data with zeros.
+ Returns a copy of the image rotated by 180 degrees.
- @return @true if the call succeeded, @false otherwise.
+ @since 2.9.2
*/
- bool Create(int width, int height, bool clear = true);
+ wxImage Rotate180() const;
/**
- Destroys the image data.
+ Rotates the hue of each pixel in the image by @e angle, which is a double in
+ the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0
+ corresponds to +360 degrees.
*/
- void Destroy();
+ void RotateHue(double angle);
/**
- Finds the first colour that is never used in the image.
- The search begins at given initial colour and continues by increasing
- R, G and B components (in this order) by 1 until an unused colour is
- found or the colour space exhausted.
+ Returns a scaled version of the image.
- The parameters @a r, @a g, @a b are pointers to variables to save the colour.
+ This is also useful for scaling bitmaps in general as the only other way
+ to scale bitmaps is to blit a wxMemoryDC into another wxMemoryDC.
- The parameters @a startR, @a startG, @a startB define the initial values
- of the colour.
- The returned colour will have RGB values equal to or greater than these.
+ The parameter @a quality determines what method to use for resampling
+ the image, see wxImageResizeQuality documentation.
- @return Returns @false if there is no unused colour left, @true on success.
+ It should be noted that although using @c wxIMAGE_QUALITY_HIGH produces much nicer
+ looking results it is a slower method. Downsampling will use the box averaging
+ method which seems to operate very fast. If you are upsampling larger images using
+ this method you will most likely notice that it is a bit slower and in extreme
+ cases it will be quite substantially slower as the bicubic algorithm has to process a
+ lot of data.
- @note
- This method involves computing the histogram, which is a
- computationally intensive operation.
+ It should also be noted that the high quality scaling may not work as expected
+ when using a single mask colour for transparency, as the scaling will blur the
+ image and will therefore remove the mask partially. Using the alpha channel
+ will work.
+
+ Example:
+ @code
+ // get the bitmap from somewhere
+ wxBitmap bmp = ...;
+
+ // rescale it to have size of 32*32
+ if ( bmp.GetWidth() != 32 || bmp.GetHeight() != 32 )
+ {
+ wxImage image = bmp.ConvertToImage();
+ bmp = wxBitmap(image.Scale(32, 32));
+
+ // another possibility:
+ image.Rescale(32, 32);
+ bmp = image;
+ }
+ @endcode
+
+ @see Rescale()
*/
- bool FindFirstUnusedColour(unsigned char* r, unsigned char* g,
- unsigned char* b, unsigned char startR = 1,
- unsigned char startG = 0,
- unsigned char startB = 0) const;
+ wxImage Scale(int width, int height,
+ wxImageResizeQuality quality = wxIMAGE_QUALITY_NORMAL) const;
/**
- Finds the handler with the given name.
+ Returns a resized version of this image without scaling it by adding either a
+ border with the given colour or cropping as necessary.
- @param name
- The handler name.
+ The image is pasted into a new image with the given @a size and background
+ colour at the position @a pos relative to the upper left of the new image.
- @return A pointer to the handler if found, @NULL otherwise.
+ If @a red = green = blue = -1 then the areas of the larger image not covered
+ by this image are made transparent by filling them with the image mask colour
+ (which will be allocated automatically if it isn't currently set).
- @see wxImageHandler
+ Otherwise, the areas will be filled with the colour with the specified RGB components.
+
+ @see Resize()
*/
- static wxImageHandler* FindHandler(const wxString& name);
+ wxImage Size(const wxSize& size, const wxPoint& pos, int red = -1,
+ int green = -1, int blue = -1) const;
+
+ //@}
+
/**
- Finds the handler associated with the given extension and type.
+ @name Conversion functions
+ */
+ //@{
- @param extension
- The file extension, such as "bmp".
- @param imageType
- The image type; one of the ::wxBitmapType values.
+ /**
+ If the image has alpha channel, this method converts it to mask.
- @return A pointer to the handler if found, @NULL otherwise.
+ If the image has an alpha channel, all pixels with alpha value less
+ than @a threshold are replaced with the mask colour and the alpha
+ channel is removed. Otherwise nothing is done.
- @see wxImageHandler
+ The mask colour is chosen automatically using
+ FindFirstUnusedColour() by this function, see the overload below if you
+ this is not appropriate.
+
+ @return Returns @true on success, @false on error.
*/
- static wxImageHandler* FindHandler(const wxString& extension,
- wxBitmapType imageType);
+ bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
/**
- Finds the handler associated with the given image type.
+ If the image has alpha channel, this method converts it to mask using
+ the specified colour as the mask colour.
- @param imageType
- The image type; one of the ::wxBitmapType values.
+ If the image has an alpha channel, all pixels with alpha value less
+ than @a threshold are replaced with the mask colour and the alpha
+ channel is removed. Otherwise nothing is done.
- @return A pointer to the handler if found, @NULL otherwise.
+ @since 2.9.0
- @see wxImageHandler
+ @param mr
+ The red component of the mask colour.
+ @param mg
+ The green component of the mask colour.
+ @param mb
+ The blue component of the mask colour.
+ @param threshold
+ Pixels with alpha channel values below the given threshold are
+ considered to be transparent, i.e. the corresponding mask pixels
+ are set. Pixels with the alpha values above the threshold are
+ considered to be opaque.
+
+ @return Returns @true on success, @false on error.
+ */
+ bool ConvertAlphaToMask(unsigned char mr, unsigned char mg, unsigned char mb,
+ unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
+
+ /**
+ Returns a greyscale version of the image.
+
+ The returned image uses the luminance component of the original to
+ calculate the greyscale. Defaults to using the standard ITU-T BT.601
+ when converting to YUV, where every pixel equals
+ (R * @a weight_r) + (G * @a weight_g) + (B * @a weight_b).
*/
- static wxImageHandler* FindHandler(wxBitmapType imageType);
+ wxImage ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const;
/**
- Finds the handler associated with the given MIME type.
+ Returns a greyscale version of the image.
+ @since 2.9.0
+ */
+ wxImage ConvertToGreyscale() const;
- @param mimetype
- MIME type.
+ /**
+ Returns monochromatic version of the image.
- @return A pointer to the handler if found, @NULL otherwise.
+ The returned image has white colour where the original has @e (r,g,b)
+ colour and black colour everywhere else.
+ */
+ wxImage ConvertToMono(unsigned char r, unsigned char g, unsigned char b) const;
- @see wxImageHandler
+ /**
+ Returns disabled (dimmed) version of the image.
+ @since 2.9.0
*/
- static wxImageHandler* FindHandlerMime(const wxString& mimetype);
+ wxImage ConvertToDisabled(unsigned char brightness = 255) const;
+
+ //@}
+
/**
- Return alpha value at given pixel location.
+ @name Miscellaneous functions
*/
- unsigned char GetAlpha(int x, int y) const;
+ //@{
+
+ /**
+ Computes the histogram of the image. @a histogram is a reference to
+ wxImageHistogram object. wxImageHistogram is a specialization of
+ wxHashMap "template" and is defined as follows:
+
+ @code
+ class WXDLLEXPORT wxImageHistogramEntry
+ {
+ public:
+ wxImageHistogramEntry() : index(0), value(0) {}
+ unsigned long index;
+ unsigned long value;
+ };
+
+ WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
+ wxIntegerHash, wxIntegerEqual,
+ wxImageHistogram);
+ @endcode
+
+ @return Returns number of colours in the histogram.
+ */
+ unsigned long ComputeHistogram(wxImageHistogram& histogram) const;
+
+ /**
+ Finds the first colour that is never used in the image.
+ The search begins at given initial colour and continues by increasing
+ R, G and B components (in this order) by 1 until an unused colour is
+ found or the colour space exhausted.
+
+ The parameters @a r, @a g, @a b are pointers to variables to save the colour.
+
+ The parameters @a startR, @a startG, @a startB define the initial values
+ of the colour.
+ The returned colour will have RGB values equal to or greater than these.
+
+ @return Returns @false if there is no unused colour left, @true on success.
+
+ @note
+ This method involves computing the histogram, which is a
+ computationally intensive operation.
+ */
+ bool FindFirstUnusedColour(unsigned char* r, unsigned char* g,
+ unsigned char* b, unsigned char startR = 1,
+ unsigned char startG = 0,
+ unsigned char startB = 0) const;
+
+ /**
+ Assignment operator, using @ref overview_refcount "reference counting".
+
+ @param image
+ Image to assign.
+
+ @return Returns 'this' object.
+ */
+ wxImage& operator=(const wxImage& image);
+
+ //@}
+
+
+ /**
+ @name Getters
+ */
+ //@{
/**
Returns pointer to the array storing the alpha values for this image.
does have it, this pointer may be used to directly manipulate the alpha values
which are stored as the RGB ones.
*/
- const unsigned char * GetAlpha() const;
-
- /**
- Returns the blue intensity at the given coordinate.
- */
- unsigned char GetBlue(int x, int y) const;
+ unsigned char* GetAlpha() const;
/**
Returns the image data as an array.
This is most often used when doing direct image manipulation.
The return value points to an array of characters in RGBRGBRGB... format
in the top-to-bottom, left-to-right order, that is the first RGB triplet
- corresponds to the pixel first pixel of the first row, the second one ---
+ corresponds to the first pixel of the first row, the second one ---
to the second pixel of the first row and so on until the end of the first
row, with second row following after it and so on.
unsigned char* GetData() const;
/**
- Returns the green intensity at the given coordinate.
+ Return alpha value at given pixel location.
*/
- unsigned char GetGreen(int x, int y) const;
+ unsigned char GetAlpha(int x, int y) const;
/**
- Returns the static list of image format handlers.
-
- @see wxImageHandler
+ Returns the red intensity at the given coordinate.
*/
- static wxList GetHandlers();
+ unsigned char GetRed(int x, int y) const;
/**
- Gets the height of the image in pixels.
+ Returns the green intensity at the given coordinate.
*/
- int GetHeight() const;
+ unsigned char GetGreen(int x, int y) const;
- //@{
/**
- If the image file contains more than one image and the image handler is
- capable of retrieving these individually, this function will return the
- number of available images.
-
- For the overload taking the parameter @a filename, that's the name
- of the file to query.
- For the overload taking the parameter @a stream, that's the ppened input
- stream with image data. Currently, the stream must support seeking.
-
- The parameter @a type may be one of the following values:
- @li wxBITMAP_TYPE_BMP: Load a Windows bitmap file.
- @li wxBITMAP_TYPE_GIF: Load a GIF bitmap file.
- @li wxBITMAP_TYPE_JPEG: Load a JPEG bitmap file.
- @li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
- @li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
- @li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
- @li wxBITMAP_TYPE_TIF: Load a TIFF bitmap file.
- @li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
- @li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
- @li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
- @li wxBITMAP_TYPE_CUR: Load a Windows cursor file (CUR).
- @li wxBITMAP_TYPE_ANI: Load a Windows animated cursor file (ANI).
- @li wxBITMAP_TYPE_ANY: Will try to autodetect the format.
-
- @return Number of available images. For most image handlers, this is 1
- (exceptions are TIFF and ICO formats).
+ Returns the blue intensity at the given coordinate.
*/
- static int GetImageCount(const wxString& filename,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
- static int GetImageCount(wxInputStream& stream,
- wxBitmapType type = wxBITMAP_TYPE_ANY);
- //@}
+ unsigned char GetBlue(int x, int y) const;
/**
- Iterates all registered wxImageHandler objects, and returns a string containing
- file extension masks suitable for passing to file open/save dialog boxes.
-
- @return The format of the returned string is @c "(*.ext1;*.ext2)|*.ext1;*.ext2".
- It is usually a good idea to prepend a description before passing
- the result to the dialog.
- Example:
- @code
- wxFileDialog FileDlg( this, "Choose Image", ::wxGetCwd(), "",
- _("Image Files ") + wxImage::GetImageExtWildcard(),
- wxFD_OPEN );
- @endcode
+ Gets the red value of the mask colour.
+ */
+ unsigned char GetMaskRed() const;
- @see wxImageHandler
+ /**
+ Gets the green value of the mask colour.
*/
- static wxString GetImageExtWildcard();
+ unsigned char GetMaskGreen() const;
/**
Gets the blue value of the mask colour.
unsigned char GetMaskBlue() const;
/**
- Gets the green value of the mask colour.
+ Gets the width of the image in pixels.
+
+ @see GetHeight(), GetSize()
*/
- unsigned char GetMaskGreen() const;
+ int GetWidth() const;
/**
- Gets the red value of the mask colour.
+ Gets the height of the image in pixels.
+
+ @see GetWidth(), GetSize()
*/
- unsigned char GetMaskRed() const;
+ int GetHeight() const;
/**
- Gets a user-defined option. The function is case-insensitive to @a name.
+ Returns the size of the image in pixels.
- For example, when saving as a JPEG file, the option @b quality is
- used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
+ @since 2.9.0
+
+ @see GetHeight(), GetWidth()
+ */
+ wxSize GetSize() const;
+
+ /**
+ Gets a user-defined string-valued option.
+
+ Generic options:
+ @li @c wxIMAGE_OPTION_FILENAME: The name of the file from which the image
+ was loaded.
+
+ Options specific to wxGIFHandler:
+ @li @c wxIMAGE_OPTION_GIF_COMMENT: The comment text that is read from
+ or written to the GIF file. In an animated GIF each frame can have
+ its own comment. If there is only a comment in the first frame of
+ a GIF it will not be repeated in other frames.
+
+ @param name
+ The name of the option, case-insensitive.
+ @return
+ The value of the option or an empty string if not found. Use
+ HasOption() if an empty string can be a valid option value.
@see SetOption(), GetOptionInt(), HasOption()
*/
wxString GetOption(const wxString& name) const;
/**
- Gets a user-defined option as an integer.
+ Gets a user-defined integer-valued option.
+
The function is case-insensitive to @a name.
If the given option is not present, the function returns 0.
- Use HasOption() is 0 is a possibly valid value for the option.
+ Use HasOption() if 0 is a possibly valid value for the option.
+
+ Generic options:
+ @li @c wxIMAGE_OPTION_MAX_WIDTH and @c wxIMAGE_OPTION_MAX_HEIGHT: If either
+ of these options is specified, the loaded image will be scaled down
+ (preserving its aspect ratio) so that its width is less than the
+ max width given if it is not 0 @em and its height is less than the
+ max height given if it is not 0. This is typically used for loading
+ thumbnails and the advantage of using these options compared to
+ calling Rescale() after loading is that some handlers (only JPEG
+ one right now) support rescaling the image during loading which is
+ vastly more efficient than loading the entire huge image and
+ rescaling it later (if these options are not supported by the
+ handler, this is still what happens however). These options must be
+ set before calling LoadFile() to have any effect.
+
+ @li @c wxIMAGE_OPTION_ORIGINAL_WIDTH and @c wxIMAGE_OPTION_ORIGINAL_HEIGHT:
+ These options will return the original size of the image if either
+ @c wxIMAGE_OPTION_MAX_WIDTH or @c wxIMAGE_OPTION_MAX_HEIGHT is
+ specified.
+ @since 2.9.3
+
+ @li @c wxIMAGE_OPTION_QUALITY: JPEG quality used when saving. This is an
+ integer in 0..100 range with 0 meaning very poor and 100 excellent
+ (but very badly compressed). This option is currently ignored for
+ the other formats.
+
+ @li @c wxIMAGE_OPTION_RESOLUTIONUNIT: The value of this option determines
+ whether the resolution of the image is specified in centimetres or
+ inches, see wxImageResolution enum elements.
+
+ @li @c wxIMAGE_OPTION_RESOLUTION, @c wxIMAGE_OPTION_RESOLUTIONX and
+ @c wxIMAGE_OPTION_RESOLUTIONY: These options define the resolution of
+ the image in the units corresponding to @c wxIMAGE_OPTION_RESOLUTIONUNIT
+ options value. The first option can be set before saving the image
+ to set both horizontal and vertical resolution to the same value.
+ The X and Y options are set by the image handlers if they support
+ the image resolution (currently BMP, JPEG and TIFF handlers do) and
+ the image provides the resolution information and can be queried
+ after loading the image.
+
+ Options specific to wxPNGHandler:
+ @li @c wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file, see
+ wxImagePNGType for the supported values.
+ @li @c wxIMAGE_OPTION_PNG_BITDEPTH: Bit depth for every channel (R/G/B/A).
+ @li @c wxIMAGE_OPTION_PNG_FILTER: Filter for saving a PNG file, see libpng
+ (http://www.libpng.org/pub/png/libpng-1.2.5-manual.html) for possible values
+ (e.g. PNG_FILTER_NONE, PNG_FILTER_SUB, PNG_FILTER_UP, etc).
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL: Compression level (0..9) for
+ saving a PNG file. An high value creates smaller-but-slower PNG file.
+ Note that unlike other formats (e.g. JPEG) the PNG format is always
+ lossless and thus this compression level doesn't tradeoff the image
+ quality.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL: Compression memory usage
+ level (1..9) for saving a PNG file. An high value means the saving
+ process consumes more memory, but may create smaller PNG file.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY: Possible values are 0 for
+ default strategy, 1 for filter, and 2 for Huffman-only.
+ You can use OptiPNG (http://optipng.sourceforge.net/) to get a suitable
+ value for your application.
+ @li @c wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE: Internal buffer size
+ (in bytes) for saving a PNG file. Ideally this should be as big as
+ the resulting PNG file. Use this option if your application produces
+ images with small size variation.
+
+ Options specific to wxTIFFHandler:
+ @li @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE: Number of bits per
+ sample (channel). Currently values of 1 and 8 are supported. A
+ value of 1 results in a black and white image. A value of 8 (the
+ default) can mean greyscale or RGB, depending on the value of
+ @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL.
+ @li @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL: Number of samples
+ (channels) per pixel. Currently values of 1 and 3 are supported.
+ A value of 1 results in either a greyscale (by default) or black and
+ white image, depending on the value of
+ @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE. A value of 3 (the default)
+ will result in an RGB image.
+ @li @c wxIMAGE_OPTION_TIFF_COMPRESSION: Compression type. By default
+ it is set to 1 (COMPRESSION_NONE). Typical other values are
+ 5 (COMPRESSION_LZW) and 7 (COMPRESSION_JPEG). See tiff.h for more
+ options.
+ @li @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC: Specifies the photometric
+ interpretation. By default it is set to 2 (PHOTOMETRIC_RGB) for RGB
+ images and 0 (PHOTOMETRIC_MINISWHITE) for greyscale or black and
+ white images. It can also be set to 1 (PHOTOMETRIC_MINISBLACK) to
+ treat the lowest value as black and highest as white.
+ If you want a greyscale image it is also sufficient to only specify
+ @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC and set it to either
+ PHOTOMETRIC_MINISWHITE or PHOTOMETRIC_MINISBLACK. The other values
+ are taken care of.
- Options for wxPNGHandler:
- @li wxIMAGE_OPTION_PNG_FORMAT: Format for saving a PNG file.
- @li wxIMAGE_OPTION_PNG_BITDEPTH: Bit depth for every channel (R/G/B/A).
+ @note
+ Be careful when combining the options @c wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL,
+ @c wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, and @c wxIMAGE_OPTION_TIFF_PHOTOMETRIC.
+ While some measures are taken to prevent illegal combinations and/or
+ values, it is still easy to abuse them and come up with invalid
+ results in the form of either corrupted images or crashes.
- Supported values for wxIMAGE_OPTION_PNG_FORMAT:
- @li wxPNG_TYPE_COLOUR: Stores RGB image.
- @li wxPNG_TYPE_GREY: Stores grey image, converts from RGB.
- @li wxPNG_TYPE_GREY_RED: Stores grey image, uses red value as grey.
+ @param name
+ The name of the option, case-insensitive.
+ @return
+ The value of the option or 0 if not found.
+ Use HasOption() if 0 can be a valid option value.
@see SetOption(), GetOption()
*/
*/
const wxPalette& GetPalette() const;
- /**
- Returns the red intensity at the given coordinate.
- */
- unsigned char GetRed(int x, int y) const;
-
/**
Returns a sub image of the current one as long as the rect belongs entirely
to the image.
*/
wxBitmapType GetType() const;
- /**
- Gets the width of the image in pixels.
-
- @see GetHeight()
- */
- int GetWidth() const;
-
- /**
- Converts a color in HSV color space to RGB color space.
- */
- static wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue& hsv);
-
/**
Returns @true if this image has alpha channel, @false otherwise.
Returns @true if the given option is present.
The function is case-insensitive to @a name.
+ The lists of the currently supported options are in GetOption() and
+ GetOptionInt() function docs.
+
@see SetOption(), GetOption(), GetOptionInt()
*/
bool HasOption(const wxString& name) const;
- /**
- Initializes the image alpha channel data.
-
- It is an error to call it if the image already has alpha data.
- If it doesn't, alpha data will be by default initialized to all pixels
- being fully opaque. But if the image has a mask colour, all mask pixels
- will be completely transparent.
- */
- void InitAlpha();
-
- /**
- Internal use only. Adds standard image format handlers.
- It only install wxBMPHandler for the time being, which is used by wxBitmap.
-
- This function is called by wxWidgets on startup, and shouldn't be called by
- the user.
-
- @see wxImageHandler, wxInitAllImageHandlers(), wxQuantize
- */
- static void InitStandardHandlers();
-
- /**
- Adds a handler at the start of the static list of format handlers.
-
- @param handler
- A new image format handler object. There is usually only one instance
- of a given handler class in an application session.
-
- @see wxImageHandler
- */
- static void InsertHandler(wxImageHandler* handler);
-
/**
Returns @true if image data is present.
*/
bool IsTransparent(int x, int y,
unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD) const;
+ //@}
+
+
+ /**
+ @name Loading and saving functions
+ */
+ //@{
+
/**
Loads an image from an input stream.
@li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
@li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
@li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
- @li wxBITMAP_TYPE_TIF: Load a TIFF bitmap file.
+ @li wxBITMAP_TYPE_TIFF: Load a TIFF bitmap file.
@li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
@li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
@li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
@see SaveFile()
*/
- bool LoadFile(wxInputStream& stream, wxBitmapType type, int index = -1);
+ virtual bool LoadFile(wxInputStream& stream,
+ wxBitmapType type = wxBITMAP_TYPE_ANY,
+ int index = -1);
/**
Loads an image from a file.
virtual bool LoadFile(const wxString& name, const wxString& mimetype,
int index = -1);
-
/**
Loads an image from an input stream.
virtual bool LoadFile(wxInputStream& stream, const wxString& mimetype,
int index = -1);
- /**
- Returns a mirrored copy of the image.
- The parameter @a horizontally indicates the orientation.
- */
- wxImage Mirror(bool horizontally = true) const;
-
- /**
- Copy the data of the given @a image to the specified position in this image.
- */
- void Paste(const wxImage& image, int x, int y);
-
- /**
- Converts a color in RGB color space to HSV color space.
- */
- static wxImage::HSVValue RGBtoHSV(const wxImage::RGBValue& rgb);
-
- /**
- Finds the handler with the given name, and removes it.
- The handler is not deleted.
-
- @param name
- The handler name.
-
- @return @true if the handler was found and removed, @false otherwise.
-
- @see wxImageHandler
- */
- static bool RemoveHandler(const wxString& name);
-
- /**
- Replaces the colour specified by @e r1,g1,b1 by the colour @e r2,g2,b2.
- */
- void Replace(unsigned char r1, unsigned char g1,
- unsigned char b1, unsigned char r2,
- unsigned char g2, unsigned char b2);
-
- /**
- Changes the size of the image in-place by scaling it: after a call to this
- function,the image will have the given width and height.
-
- For a description of the @a quality parameter, see the Scale() function.
- Returns the (modified) image itself.
-
- @see Scale()
- */
- wxImage& Rescale(int width, int height,
- int quality = wxIMAGE_QUALITY_NORMAL);
-
- /**
- Changes the size of the image in-place without scaling it by adding either a
- border with the given colour or cropping as necessary.
-
- The image is pasted into a new image with the given @a size and background
- colour at the position @a pos relative to the upper left of the new image.
-
- If @a red = green = blue = -1 then use either the current mask colour
- if set or find, use, and set a suitable mask colour for any newly exposed
- areas.
-
- @return The (modified) image itself.
-
- @see Size()
- */
- wxImage& Resize(const wxSize& size, const wxPoint& pos, int red = -1,
- int green = -1, int blue = -1);
-
- /**
- Rotates the image about the given point, by @a angle radians.
-
- Passing @true to @a interpolating results in better image quality, but is slower.
-
- If the image has a mask, then the mask colour is used for the uncovered
- pixels in the rotated image background. Else, black (rgb 0, 0, 0) will be used.
-
- Returns the rotated image, leaving this image intact.
- */
- wxImage Rotate(double angle, const wxPoint& rotationCentre,
- bool interpolating = true,
- wxPoint* offsetAfterRotation = NULL) const;
-
- /**
- Returns a copy of the image rotated 90 degrees in the direction
- indicated by @a clockwise.
- */
- wxImage Rotate90(bool clockwise = true) const;
-
- /**
- Rotates the hue of each pixel in the image by @e angle, which is a double in
- the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0
- corresponds to +360 degrees.
- */
- void RotateHue(double angle);
-
/**
Saves an image in the given stream.
*/
virtual bool SaveFile(const wxString& name) const;
- /**
- Saves an image in the given stream.
-
- @param stream
- Opened output stream to save the image to.
- @param type
- MIME type.
- */
- virtual bool SaveFile(wxOutputStream& stream, wxBitmapType type) const;
-
- /**
- Returns a scaled version of the image.
-
- This is also useful for scaling bitmaps in general as the only other way
- to scale bitmaps is to blit a wxMemoryDC into another wxMemoryDC.
-
- The parameter @a quality determines what method to use for resampling the image.
- Can be one of the following:
- - wxIMAGE_QUALITY_NORMAL: Uses the normal default scaling method of pixel
- replication
- - wxIMAGE_QUALITY_HIGH: Uses bicubic and box averaging resampling methods
- for upsampling and downsampling respectively
-
- It should be noted that although using @c wxIMAGE_QUALITY_HIGH produces much nicer
- looking results it is a slower method. Downsampling will use the box averaging
- method which seems to operate very fast. If you are upsampling larger images using
- this method you will most likely notice that it is a bit slower and in extreme
- cases it will be quite substantially slower as the bicubic algorithm has to process a
- lot of data.
+ /**
+ Saves an image in the given stream.
- It should also be noted that the high quality scaling may not work as expected
- when using a single mask colour for transparency, as the scaling will blur the
- image and will therefore remove the mask partially. Using the alpha channel
- will work.
+ @param stream
+ Opened output stream to save the image to.
+ @param type
+ MIME type.
+ */
+ virtual bool SaveFile(wxOutputStream& stream, wxBitmapType type) const;
- Example:
- @code
- // get the bitmap from somewhere
- wxBitmap bmp = ...;
+ //@}
- // rescale it to have size of 32*32
- if ( bmp.GetWidth() != 32 || bmp.GetHeight() != 32 )
- {
- wxImage image = bmp.ConvertToImage();
- bmp = wxBitmap(image.Scale(32, 32));
- // another possibility:
- image.Rescale(32, 32);
- bmp = image;
- }
- @endcode
- @see Rescale()
+ /**
+ @name Setters
*/
- wxImage Scale(int width, int height,
- int quality = wxIMAGE_QUALITY_NORMAL) const;
+ //@{
/**
This function is similar to SetData() and has similar restrictions.
*/
void SetAlpha(int x, int y, unsigned char alpha);
+ /**
+ Removes the alpha channel from the image.
+
+ This function should only be called if the image has alpha channel data,
+ use HasAlpha() to check for this.
+
+ @since 2.9.1
+ */
+ void ClearAlpha();
+
/**
Sets the image data without performing checks.
The data must have been allocated with @c malloc(), @b NOT with
@c operator new.
- After this call the pointer to the data is owned by the wxImage object,
- that will be responsible for deleting it.
+ If @a static_data is @false, after this call the pointer to the data is
+ owned by the wxImage object, that will be responsible for deleting it.
Do not pass to this function a pointer obtained through GetData().
*/
- void SetData(unsigned char* data);
+ void SetData(unsigned char* data, bool static_data = false);
+
+ /**
+ @overload
+ */
+ void SetData(unsigned char* data, int new_width, int new_height,
+ bool static_data = false);
/**
Specifies whether there is a mask or not.
unsigned char mg,
unsigned char mb);
- //@{
/**
Sets a user-defined option. The function is case-insensitive to @a name.
For example, when saving as a JPEG file, the option @b quality is
used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
+ The lists of the currently supported options are in GetOption() and
+ GetOptionInt() function docs.
+
@see GetOption(), GetOptionInt(), HasOption()
*/
void SetOption(const wxString& name, const wxString& value);
+
+ /**
+ @overload
+ */
void SetOption(const wxString& name, int value);
- //@}
/**
Associates a palette with the image.
This routine performs bounds-checks for the coordinate so it can be considered
a safe way to manipulate the data.
*/
- void SetRGB(wxRect& rect, unsigned char red,
+ void SetRGB(const wxRect& rect,
+ unsigned char red,
unsigned char green,
unsigned char blue);
*/
void SetType(wxBitmapType type);
+ //@}
+
+
+
/**
- Returns a resized version of this image without scaling it by adding either a
- border with the given colour or cropping as necessary.
+ @name Handler management functions
+ */
+ //@{
- The image is pasted into a new image with the given @a size and background
- colour at the position @a pos relative to the upper left of the new image.
+ /**
+ Register an image handler.
- If @a red = green = blue = -1 then the areas of the larger image not covered
- by this image are made transparent by filling them with the image mask colour
- (which will be allocated automatically if it isn't currently set).
+ Typical example of use:
+ @code
+ wxImage::AddHandler(new wxPNGHandler);
+ @endcode
- Otherwise, the areas will be filled with the colour with the specified RGB components.
+ See @ref image_handlers for a list of the available handlers. You can
+ also use ::wxInitAllImageHandlers() to add handlers for all the image
+ formats supported by wxWidgets at once.
- @see Resize()
+ @param handler
+ A heap-allocated handler object which will be deleted by wxImage
+ if it is removed later by RemoveHandler() or at program shutdown.
*/
- wxImage Size(const wxSize& size, const wxPoint& pos, int red = -1,
- int green = -1, int blue = -1) const;
+ static void AddHandler(wxImageHandler* handler);
/**
- Assignment operator, using @ref overview_refcount "reference counting".
+ Deletes all image handlers.
+ This function is called by wxWidgets on exit.
+ */
+ static void CleanUpHandlers();
- @param image
- Image to assign.
+ /**
+ Finds the handler with the given name.
- @return Returns 'this' object.
+ @param name
+ The handler name.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
*/
- wxImage& operator=(const wxImage& image);
+ static wxImageHandler* FindHandler(const wxString& name);
+
+ /**
+ Finds the handler associated with the given extension and type.
+
+ @param extension
+ The file extension, such as "bmp".
+ @param imageType
+ The image type; one of the ::wxBitmapType values.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
+ */
+ static wxImageHandler* FindHandler(const wxString& extension,
+ wxBitmapType imageType);
+
+ /**
+ Finds the handler associated with the given image type.
+
+ @param imageType
+ The image type; one of the ::wxBitmapType values.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
+ */
+ static wxImageHandler* FindHandler(wxBitmapType imageType);
+
+ /**
+ Finds the handler associated with the given MIME type.
+
+ @param mimetype
+ MIME type.
+
+ @return A pointer to the handler if found, @NULL otherwise.
+
+ @see wxImageHandler
+ */
+ static wxImageHandler* FindHandlerMime(const wxString& mimetype);
+
+ /**
+ Returns the static list of image format handlers.
+
+ @see wxImageHandler
+ */
+ static wxList& GetHandlers();
+
+ /**
+ Internal use only. Adds standard image format handlers.
+ It only install wxBMPHandler for the time being, which is used by wxBitmap.
+
+ This function is called by wxWidgets on startup, and shouldn't be called by
+ the user.
+
+ @see wxImageHandler, wxInitAllImageHandlers(), wxQuantize
+ */
+ static void InitStandardHandlers();
+
+ /**
+ Adds a handler at the start of the static list of format handlers.
+
+ @param handler
+ A new image format handler object. There is usually only one instance
+ of a given handler class in an application session.
+
+ @see wxImageHandler
+ */
+ static void InsertHandler(wxImageHandler* handler);
+
+ /**
+ Finds the handler with the given name, and removes it.
+
+ The handler is also deleted.
+
+ @param name
+ The handler name.
+
+ @return @true if the handler was found and removed, @false otherwise.
+
+ @see wxImageHandler
+ */
+ static bool RemoveHandler(const wxString& name);
+
+ //@}
+
+
+ /**
+ Returns @true if at least one of the available image handlers can read
+ the file with the given name.
+
+ See wxImageHandler::CanRead for more info.
+ */
+ static bool CanRead(const wxString& filename);
+
+ /**
+ Returns @true if at least one of the available image handlers can read
+ the data in the given stream.
+
+ See wxImageHandler::CanRead for more info.
+ */
+ static bool CanRead(wxInputStream& stream);
+
+ //@{
+ /**
+ If the image file contains more than one image and the image handler is
+ capable of retrieving these individually, this function will return the
+ number of available images.
+
+ For the overload taking the parameter @a filename, that's the name
+ of the file to query.
+ For the overload taking the parameter @a stream, that's the opened input
+ stream with image data.
+
+ See wxImageHandler::GetImageCount() for more info.
+
+ The parameter @a type may be one of the following values:
+ @li wxBITMAP_TYPE_BMP: Load a Windows bitmap file.
+ @li wxBITMAP_TYPE_GIF: Load a GIF bitmap file.
+ @li wxBITMAP_TYPE_JPEG: Load a JPEG bitmap file.
+ @li wxBITMAP_TYPE_PNG: Load a PNG bitmap file.
+ @li wxBITMAP_TYPE_PCX: Load a PCX bitmap file.
+ @li wxBITMAP_TYPE_PNM: Load a PNM bitmap file.
+ @li wxBITMAP_TYPE_TIFF: Load a TIFF bitmap file.
+ @li wxBITMAP_TYPE_TGA: Load a TGA bitmap file.
+ @li wxBITMAP_TYPE_XPM: Load a XPM bitmap file.
+ @li wxBITMAP_TYPE_ICO: Load a Windows icon file (ICO).
+ @li wxBITMAP_TYPE_CUR: Load a Windows cursor file (CUR).
+ @li wxBITMAP_TYPE_ANI: Load a Windows animated cursor file (ANI).
+ @li wxBITMAP_TYPE_ANY: Will try to autodetect the format.
+
+ @return Number of available images. For most image handlers, this is 1
+ (exceptions are TIFF and ICO formats as well as animated GIFs
+ for which this function returns the number of frames in the
+ animation).
+ */
+ static int GetImageCount(const wxString& filename,
+ wxBitmapType type = wxBITMAP_TYPE_ANY);
+ static int GetImageCount(wxInputStream& stream,
+ wxBitmapType type = wxBITMAP_TYPE_ANY);
+ //@}
+
+ /**
+ Iterates all registered wxImageHandler objects, and returns a string containing
+ file extension masks suitable for passing to file open/save dialog boxes.
+
+ @return The format of the returned string is @c "(*.ext1;*.ext2)|*.ext1;*.ext2".
+ It is usually a good idea to prepend a description before passing
+ the result to the dialog.
+ Example:
+ @code
+ wxFileDialog FileDlg( this, "Choose Image", ::wxGetCwd(), "",
+ _("Image Files ") + wxImage::GetImageExtWildcard(),
+ wxFD_OPEN );
+ @endcode
+
+ @see wxImageHandler
+ */
+ static wxString GetImageExtWildcard();
+
+ /**
+ Converts a color in RGB color space to HSV color space.
+ */
+ static wxImage::HSVValue RGBtoHSV(const wxImage::RGBValue& rgb);
+
+ /**
+ Converts a color in HSV color space to RGB color space.
+ */
+ static wxImage::RGBValue HSVtoRGB(const wxImage::HSVValue& hsv);
+};
+
+
+class wxImageHistogram : public wxImageHistogramBase
+{
+public:
+ wxImageHistogram();
+
+ // get the key in the histogram for the given RGB values
+ static unsigned long MakeKey(unsigned char r,
+ unsigned char g,
+ unsigned char b);
+
+ // find first colour that is not used in the image and has higher
+ // RGB values than RGB(startR, startG, startB)
+ //
+ // returns true and puts this colour in r, g, b (each of which may be NULL)
+ // on success or returns false if there are no more free colours
+ bool FindFirstUnusedColour(unsigned char *r,
+ unsigned char *g,
+ unsigned char *b,
+ unsigned char startR = 1,
+ unsigned char startG = 0,
+ unsigned char startB = 0 ) const;
};
+/**
+ An instance of an empty image without an alpha channel.
+*/
+wxImage wxNullImage;
+
+
// ============================================================================
// Global functions/macros
// ============================================================================
-/** @ingroup group_funcmacro_appinitterm */
+/** @addtogroup group_funcmacro_appinitterm */
//@{
/**
- Initializes all available image handlers. For a list of available handlers,
- see wxImage.
+ Initializes all available image handlers.
+
+ This function calls wxImage::AddHandler() for all the available image
+ handlers (see @ref image_handlers for the full list). Calling it is the
+ simplest way to initialize wxImage but it creates and registers even the
+ handlers your program may not use. If you want to avoid the overhead of
+ doing this you need to call wxImage::AddHandler() manually just for the
+ handlers that you do want to use.
@see wxImage, wxImageHandler
projects / wxWidgets.git / blobdiff